Single electrons confined to a free neon surface and manipulated through the circuit quantum electrodynamics architecture is a promising novel quantum computing platform. Understanding the exact physical nature of the electron-on-neon ($e\mathrm{Ne}$) charge states is important for realizing this platform’s potential for quantum technologies. We investigate how resonator trench depth and substrate surface properties influence the formation of $e\mathrm{Ne}$ charge states and their coupling to microwave resonators. Through experimental observation supported by modeling, we find that shallow-depth etching of the resonator features maximizes coupling strength. By comparing the trapping statistics and surface morphology of devices with altered trench roughness, our Letter reveals the role of fabrication-induced surface features in the formation of strongly coupled $e\mathrm{Ne}$ states.

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• Quantum fluids & solids
• Qubits
• Surfaces